I have a Western Digital WD Element 500GB external HDD (NTFS formatted). When I plug it in, the system freeze but my mouse still can move (but can not be used). Sometimes it can be mounted but when I try to copy data to it, the system crashed again.
I tried to start Ubuntu with the external HDD already plugged in (I plugged it in before start machine) and couldnt access the system any more. It appearred the black screen with something like this:
"Busybox 1.17 ....etc. Enter help to see built-in commands."
At first I thought it was the GRUB problem but it wasnt. I still can choose what OS at the GRUB screen.